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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '436d8974742e1b83425aaa1d3cd9029f8359af319925646c8d40f2e4f365050e' 
  AND token = 'YH6W7zDDd00g3v0CEaLzAtrsv+jbEMA/bhz32MRvv3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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