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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '078d434d2e69fa5fc5b0f92151bb83d882bcb6bd9c7c92217d741b50e74d0afc' 
  AND token = 'yi03Jj0Z89iPi2HV3pjKixedzcWvf5beyXHKIVRIu10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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