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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5046ae47a529f6dbc27eedce5fc72be626ae5a84d098472a86233a0f1a409b8b' 
  AND token = 'DjbMCNH1wNySBOqBHOW5A3AbOriag+KgH1ut5xYoqGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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