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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e96ef123cd9c9ff932e213a17bbfb1b52a868ea30412103fff304bfa5d21174c' 
  AND token = 'jQ8E4uVkRCB0oSubKb28jv8Orc+dv0gKqqv3wWgebsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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