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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be64678f3a1b3518407e9cd86a2461cd94d083c2eabedb92e3ae66254a5a6bcd' 
  AND token = 'XfMxBaiZ4J5pjwDPVfJ/JBt9r14HY4CUZi1yd3f/wH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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