Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1021a397704398281529663b7f715ee46a375ec259855d084832e8d60cc5d9ea' 
  AND token = 'N9ML4BYiqzd0MMlBgiHubmaCydjpIwAzqcwBZsAXTeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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