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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '045b6af6d7c0ea1265368e2980f39c3df0b2f6e1f19eefd3d81f4a6164ed7924' 
  AND token = '559IAW/530MwcRDnUPdWmE3jSbn5aV657ATIbvKdG0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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