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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20af75cb9e15286721997aafa09358b24aff72da1073233490476d1a6224b323' 
  AND token = 'OBdmIW71tGOp+3CGcpHq3luacDTpRJnqfKWdh5siSHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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