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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b58b986e1aaab992f4c84366a17f7024282b3fbd061611899df0936f01c3c2ed' 
  AND token = 'cAV17Z6dWdVMlM9baN4X5v5Ms9EthdmjPLOv/OLwrko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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