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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6127fad8e6b046cce49ec73a3530aac4c806a481f10fe2a169ab187d311b099' 
  AND token = 'QO37TbU8KPO1tDotqDbZK1IJPP6y2LG+EI2A8i25wWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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