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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f542dca8f559a278e33188053869ec00c15c9ce25a94e3042447e4504c3d71e4' 
  AND token = 'dG8CxRugLSsWfhve3b8ys58w59mK0tdYULRagOSG7qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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