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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7aeee73e733bbc24a83a33f6d76f2363b4c67687af826587daa4222b9cb83166' 
  AND token = 'w9p5xrAqQv4y1bQ9+ud1jMKq8Yvhvx6F2zPvMMe5Gic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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