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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f572f884412fe7a9cb9b7d8a15e1d825068c7d8020b3f3466fbad532c13c0a5f' 
  AND token = 'yebYrAVE0i462ee7S3gLbv6NO10zn0/tgS1yWfi/QZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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