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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9628c9137b54fa5b257e34e30ad29323446ea8dc0fdd4e79242fb0ecd971491' 
  AND token = '8wv0Z7283QFydv2IQEsFivHvTzrRnUIJ714dse8ZWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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