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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c23cb9ce92ca4d6028a2e715e5eecfcbc844ca229cec497058a7c718ceb3cfc5' 
  AND token = 'xKl1xnxvgJIksDzpKlxgrNi5pniC2XQBzZgsvEAM3D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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