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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '206313167f095a553e583d3c36feb4c1092250f0c782a8b324243b1b0554bf98' 
  AND token = 'JJE1uUUmf1vOSqVBxBPLe62swRT6tfMaxyVEe9r0xfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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