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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c2b40514bd175b049e7c633368e087fc30ad8a9e4076108659fbd1361f57ad3' 
  AND token = 'chisMhcITcqefesWccwH+d8dPLWNtadQ9zeOGoayp0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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