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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c87472583b073735ea8ad92fcd4deea28cbafaf62795b7c001e831f76ea1c3a5' 
  AND token = '1UCWlOasKf4IUPiEf85yo67+Qep+c3qb6bqlva0a2i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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