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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '493f6beae315cd5a7f288a47a34cec4e2eb984e51d47eadda386405242598ab6' 
  AND token = 'j6pHYE/k02gWr7MrZ93ns/hrTquEJ62PJNc9RuWjv2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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