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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aeb372c78db96defdde88467938e9c76990b3476c07cd5ff919d037e1cbb40e4' 
  AND token = 'yZoB6e4pnubk7i76lxn3I6vqAfX1RR/aj8nelWSkvgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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