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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cae4cd397b0bda4eb4a0412f61fec3b5d20c7fcc94faf1594e67f5c2266475a5' 
  AND token = 'SOgmls9KYp1jkR0AvSDn/28gfADV24oY20+L0FX9Zfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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