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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '709dae66a646971f5652bd2c2781202c470e8849b9c9507b2069a974e865fbf1' 
  AND token = 'yPyjM7SMKm/6p7dPn//T4bntGaH0PrME+ItnxsGO9yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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