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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ceb1ab2530b55074f7d4f774b60c14bc2b2ae32e4feefff7ff5d2fecaadef1dd' 
  AND token = 'ZshWzQc+lTFh6JHQAXntm3Aql2qWV3EzRT0jZfLumVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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