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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b8c8474bcbfc50b3169c79db729c20ba5ce3952e144eb63a5116046346a142d' 
  AND token = 'MbiU48Y4nmDjue7jIVJGb2qZuSq8WUhjxhKo1hBA59E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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