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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '672dc7de0b76c7a8f0a7e7f70cb0cb69e269afea7b4b079d590ae89cd0143cac' 
  AND token = 'Qjb8+YvRJvVYMXulwvV/sOsyODvvnMZ+KCUMuTOrGa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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