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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6dbf93e8736b0bdcb2ce965a84cbed560561ebd2fc812bb74bf42968b056350d' 
  AND token = 'FN2ZAk/3koCIX2QQpfGM5AIVm2DGNSSGlH5XScM+xPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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