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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6984bf1d367d542bc31bceb188998a0df643cb60a060caff6653695b3b3d0038' 
  AND token = '4Rb/SOgXuDeoR6rEOCU/I1BEtrcKd7NxlF1mAnJq+iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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