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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '036fe81ed305bc4f8f4fbffd2a8be9a6bde6ac7870b6d87a2e32bc87dc97b4f0' 
  AND token = '4EJknzKdltTc6Zcf2oirYUn45HHySkgjXnT6TetmzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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