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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a267c2f4d8ec03b42da13a13e62ed2b7a53bcb838d019f8f8e70cabf8bf1dfa' 
  AND token = 'Njy144Kn03Vudl2+GariiPDP3/rtV8C7zYf+8btTOs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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