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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4577c3695b3d4cba9cbf39c60b5ab9a6670af01c64cf342c34f0c60c66a0cfda' 
  AND token = 'pUgBH8WGwIbUf+UDS65T5wsf0sedt6S61NB0u3KHiq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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