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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10b13e8bbaa78719a17e92ca3c9b5ce6aa875d1783614edb7ae995c95fc322d9' 
  AND token = '8UGXBCr1nftbMABciBnFp9yvH0i+9BBlzKieY47tKPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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