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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '660079c7e83d7285c4daef41db2ca857bac063a33c76a4b986e4f786c9a65dde' 
  AND token = 'SC8ZmVy1TYjCsyeG8XIkhUw2SdVdwiUwkKtYJ9hhfOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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