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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d1911971c139c36b7cd26e9a9a79a0c5460863f8dc6159b8a1db99fe6f58a99' 
  AND token = 'UzVfMOb/q58fsqOnDW5uX7IQCbqOIuILE8IIedPPuak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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