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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72a306ad1593b9f9cbcdf401b2c55a4d0a4f46759097f5bb9fb01726d552bb5c' 
  AND token = 'GyEgu27yo7KarMJOjTKUqar0i62fihlxP7noaxGX4D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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