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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93fbd342a76b95e6d4207449c21f932ad3bcfb4a972cef4a589f70de09e307d2' 
  AND token = 'x4irMddfPl3n/lOGHjueFfkwotZTc6P0GpV/tZYCWTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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