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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9685312811804ea67612c3708c08c2ca9a21cddae2d2758edb4ac72e9d84c978' 
  AND token = 't4pGNegFHphcv9ukI7J82m/0xelUMI7GdpoWvh2ukOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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