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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce642ba3b32a590163d2274fc006ffd0542138b70387843ab9cee28999430865' 
  AND token = 'BimyPTfECyj2x/gcl/CkTlnAmoA5ixIbgaVqENHsGOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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