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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcabf65f4f29c0d860c832cad82d858a6a7f0bec4a85242de5bc99ac07dcc821' 
  AND token = '2VaC2Uwj2iSMoBuLCNHjUwQEW91nXG2IciDJoSbK/Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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