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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '286d20956908080fae33a1c10e6518608c22bc080c9ea7346a3d39e7d6a6822e' 
  AND token = 'MCNRcZojR5cKSp4kPjnCihZazvzl/+0lYz8z8D6XCVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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