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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '920747ade4d816b43f6c0ce3b32cb65ab93e7249b4d94c0a0a0e76a60776cbda' 
  AND token = 'mkrv+kGV0O9iXMh014gNfyglnYEvFSn9dBhjelHDFno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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