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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a3efe55db8aaaaeb7571d8192275e43eaf900207c3f09d15a1ecd135b404ef2' 
  AND token = '58em1Q47jZolNlxYjbh6JETi3IN5fCVE9v/Q8+L0eF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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