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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5df346e530baea181c4b0fb7ed3ec156d4b27b696a5efc2be11b249e2c0353df' 
  AND token = 'qONw5g9k3zHSelAaZSr39tEPh2n61Nxg5iuZzXhqCFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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