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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d37171ae0336114163901f43895117ba313ce20565166305d1e115ff6238522' 
  AND token = '4yKZAW65Bma3MgnLHI1EHEtNJXEQ0mN60DMP8FUyvRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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