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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d57ea54bde8aaf40c14b0fb0e7b8d9f7ca78352fbdafc3e7e87704846c85725' 
  AND token = '+a9PIBz6LXJXgaFjhJ8j3OWCFFDaOU3clDwORxkI45c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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