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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3da75833b6d9ca7b063488b2de4c5ffe7857af4c98bb4e74cfa3f1177375cf67' 
  AND token = 'tF7VseLfBA4Sh296C3w6suA6vh1SvnL/D117CUxrkDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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