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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03f6a7b5e5973d2df5855a5d1c9a9095beeefd76543ddac0d79a26a6d3e6bf34' 
  AND token = 'OyDi10vYh4se7O6a1VDcfnlt19ssQrQvcL8qcH0xkNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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