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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e697bc710511601fe1007926558ea5a80c566d8ea2e70035ea9886d54fed621' 
  AND token = 'KV86EdpSUHMQoFL11oKEDMeC/jMWmglqLcGIaJusklI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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