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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '29aac12e469d5036de2d406d23feeef9453d2963418c519012a1f1a0e6e459c7' 
  AND token = 'Dd/+CuJtnMiKzFVj9j2DfEYR1I1wdnUSDUtopPbKGgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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