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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b02b297bc8fd36cbf123ac7e3f4e36abdace0ff8bb2aee7ceeecc21d564bb4dc' 
  AND token = '+K25efJtpxLGc+RoJlQQZdemV8IUAV31S713yBeIGBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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