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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd56edee1414e6ae3abe7d09b8dbcbb90bcb1a7436f4a346023ce545563a99047' 
  AND token = 'LLjh6XEh8qJudicZqSaz299DUXbO3qguOp4S+bVCsWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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