Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e006b891cd0a7a9bec3ad9402ac0f66c3c0edb65913bd51941aa03585bca7f9d' 
  AND token = 'lO1ktiTnz7Rqc1TfZJ8X8EKjvfjKbVOkF2Jct/HVNUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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