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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b760be101934cc5cb96aba8a1149529910b3e18e4abc1d8380ffeec0c7c2a7b3' 
  AND token = 'jjr1JNG+1ywsxZksF2LM0g1FiCoSiH0F2egKt06JloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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