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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d16a3c34aa9c7767d29f68ffc4c30793fa04259d6e922c7dc4b8bdda9d65b2c' 
  AND token = 'xyOCWwIKs3KBk1NKidKcuMb2vv/Z71lrTtUzI/9GcTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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