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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32c4bc9df96d8ba1c72998307594ece049e53926c9e9cdea6958fdb8aa437595' 
  AND token = 'ET2EsHr2b6mY8KsljyMPO0H51ar7MB2CzBh1kJPMMAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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