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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae0392b6b24cc337281764323a92383d3009e845988921ad8787df0696829914' 
  AND token = 'emmeYlWltQ3F02vKWWPUJf4jIBMZ3jWmmIr9UjLVW60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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