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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1fa88405c24da6d46eecbd18a412e6eb33e8b1fe839f3e135fbb365f2508f23' 
  AND token = 'bNeblozk9MUtJfVljJOX+B0ZyWf2OCyFM6BPExS8RHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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