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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd274a1a3331d5b40e22b00bd667b3b12a2059713861f277d4cf0b21c29c5233' 
  AND token = 'v8qIKpKkTePutrp3Cp2Ccj4mAaBI5di1GK9UUuwbrd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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