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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf849905c2a5b8aac2c0a0e8d3f47c56cb005ed00f06c91954cfa9e3db7c4bb6' 
  AND token = 'h0kKuV78OTvPwBMcihCR2ttDW9MEAr56eoXbpN4QPTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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