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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b19c718149e8c1c908c297b0e032f2e9c5e47ad0858a93b82fbc9b13639c1935' 
  AND token = 'm7SoLHGK5Ft0VulajtPAoaVOZWraXy3U9MnAcmlYaCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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