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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db96fc72ae2a68f1fe34e0d247f28e5d4597de94ee0f77d4bf969ba69f2310a6' 
  AND token = 'zswDWlL2Fb2ZdtVN6RdB6Hm7evRRsW6seQWJbZhZr6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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