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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b102619722439d29dd037422db225318796bf6c5396d21385c834bc8dbcc74e' 
  AND token = 'EpMcPD0T1xZ1D/42y4mWm0R2fAkh5LDPdrqrOVLo+Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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