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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74545699dbf5add081b93792c15e84d6ab5d4800f51aa15f527e00f64a5942d4' 
  AND token = 'eIH9OlcV87D7AAjfioEob5054eX5Dpw1tLw3YynKNtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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