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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cce0452305130eecfb664d69c71fddb3fca3158fde6589e489895743cb085633' 
  AND token = 'S/P/E6QzfhE7gc0LCqVPHacmm6k3Nu8I7BgNEXu+bT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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