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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '932aa4b34c6e00ca1381571c8bc8641d45e5d3d3250e4ad880a9e7ec1d012ff8' 
  AND token = 'G1WqqCm2z7Tda1AKdjabDtmx+RMRoCQQG0bxASV2fQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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