Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b025fa1c6278e39d1f226328c1144f5c807e7f1e2ec08b2611e63ac1d7a9d74c' 
  AND token = 'O/mFq2dr1FZZR2MudWeOaNhbqWC4eqfVQb93iPBJstA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}