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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3417435b9e0e9c5d12530f78cea43b1bd48efb5fdc654ffc2d121cfe660aad99' 
  AND token = '96Yb8wYbFCXqcLgxMviRiw5jkmctHxIRLf+Z8BcGF20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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