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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c55dacdc17e314005da6f61f0eb28eadb2f435489cc55201b6033a4099fec1e' 
  AND token = 'm5MXq40/Sg7kcfTMdZ0kTp+87cqsMu+vMK9I1nsMwQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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