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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '722a090ec07529cbd856a3a581db2d20a483556dc2c12edcaf97a821ac9e0232' 
  AND token = 'YAukz1S2bDBDaokxsgtBQa98yaiKZwg6kF0uaA/ij2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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