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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1aba6c517383ad41c2523871e7e2c2eef8a15beaab5de893ce296c43af6c861' 
  AND token = '0J03h2MRB6klv+O0IskXTJ6PIFGrZ3HkrjFpaL8IXpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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