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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9489a3b6f681089dc468042e709d13487b60604e039a196cdc9a09ed1f28fec2' 
  AND token = 'DwAuxEjplJTWdVvYAotkO+yDMWLlO3bIO/v05RhTN5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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