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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'caeaac6b1353880b9888696a04487fec1a90929b133344b7597f2fc715c7f007' 
  AND token = 'g6mcn0AuJWnL0tI6EvRU/TmeBM3sgG4xm9kLkYhcDUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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