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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfb3cbe436ecc47eaa3a73ccfe8b82b5ad4c69f0d8a2a181f7d56aa63fbc3193' 
  AND token = 'Wr+bUfEkpDaHNooYoef88GMh+iwhtUO0bjYTWCJOZGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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