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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '774efc37bfccbce8c8d3b0015f2803c3bd507e4abc8757a8318c78860a66d50b' 
  AND token = 'nlgnrCkdifuLIrJiFqW/38nStOxD4brBPB+Cbxfchio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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