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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b93e95e0edc6368273b81ee98fc9c51a14b50cda6fa48216f6e443120309c7c2' 
  AND token = 'kQfx+FpbSQQIPbDyi9oXHCERRXdavVHOQFPp1J5SWVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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